GB464788A - Improvements in or relating to modulated carrier wave transmitters and apparatus for use therewith - Google Patents
Improvements in or relating to modulated carrier wave transmitters and apparatus for use therewithInfo
- Publication number
- GB464788A GB464788A GB2940535A GB2940535A GB464788A GB 464788 A GB464788 A GB 464788A GB 2940535 A GB2940535 A GB 2940535A GB 2940535 A GB2940535 A GB 2940535A GB 464788 A GB464788 A GB 464788A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch
- modulated carrier
- stage
- voltages
- cathode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000012544 monitoring process Methods 0.000 abstract 2
- 238000009434 installation Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000010079 rubber tapping Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/06—Measuring depth of modulation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
464,788. Wireless transmitting systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., and TRINGHAM, W. S. L. Oct. 24, 1935, No. 29405. Addition to 428,700. [Class 40 (v)] In a modulation monitoring-installation for radio and like transmitters of the kind d in which a cathode-ray tube is switched in turn to various stages of the transmitter, an amplifier is provided between the switch and the cathode-ray tube, and the modulated carrier wave is rectified by a rectifier situated adjacent the switch. In the circuit shown, the switch S comprises two perpendicular rotary arms A1, A2 movable into three positions over the twelve contacts. According to the position of the switch arms, voltages are received from three different stages of the transmitter and are applied across the grid and cathode of an amplifier V, the plate circuit of which is coupled to the cathoderay indicator. Voltages from the pre-modulation stage may be taken from a tapping on the anode resistance AR of that stage and fed to the switch contacts through a high-frequency cable C. Similarly, voltages from the modulator stage are fed through a cable C1. The modulated carrier stage is connected by a cable C2 to a flatly-tuned circuit K2, L2, connected in the circuit of a diode rectifier V1, the load resistance R1 of which is connected to the switch contacts. In a modification, the modulated carrier is taken from the aerial feeder by bridging that feeder at a point about one-eighth of a wave-length from its input end by a small condenser in series with a low resistance from across which the carrier voltage is taken to the rectifier V1. This latter arrangement may also be used for feeding a local monitoring television reproducer. The rotary switch may be replaced by cam-operated switch arms, Figs. 2 and 3 (not shown). The apparatus enclosed in the dotted line is situated at the monitoring and switching point.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2940535A GB464788A (en) | 1935-10-24 | 1935-10-24 | Improvements in or relating to modulated carrier wave transmitters and apparatus for use therewith |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2940535A GB464788A (en) | 1935-10-24 | 1935-10-24 | Improvements in or relating to modulated carrier wave transmitters and apparatus for use therewith |
Publications (1)
Publication Number | Publication Date |
---|---|
GB464788A true GB464788A (en) | 1937-04-26 |
Family
ID=10291060
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2940535A Expired GB464788A (en) | 1935-10-24 | 1935-10-24 | Improvements in or relating to modulated carrier wave transmitters and apparatus for use therewith |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB464788A (en) |
-
1935
- 1935-10-24 GB GB2940535A patent/GB464788A/en not_active Expired
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